docs: def close(self):
          """Close the sysfs LED.
  
          Raises:
              LEDError: if an I/O or OS error occurs.
  
          """
          if self._fd is None:
              return
  
          try:
              os.close(self._fd)
          except OSError as e:
              raise LEDError(e.errno, "Closing LED: " + e.strerror)
  
          self._fd = None